TCA4311A: SDA SCL volatge level compressing

Part Number:TCA4311A

Hi technical Team,

I have use the Above IC for my deign.At 100Khz of frequency, the voltage level level get decreased gradually.At smaller frequency like Hz,the voltage level not get decreased.I have connected the Vcc and EN pin to 5V and Ready pin is connected to 5V through 10K resistor.And SCL IN,SDA IN,SCL OUT and SDA OUT pins. In the reference design it is connected like this,I have followed that.But at 100KHz frequency of SCL lines,the output voltage level is 2.7V.Please provide the input to move further.

Thanks,

V.Vishnuprasanth.